Chuck



Nov. 16 1926.

' H. NIELSEN cnucx I Filed Jan. z, 1926 Patented Nov. 16, 1926.

ITED sates HOLGER NIELSEN, OF 'LAWTON,'MICHIGAN, nssie ivon TonI LsEN- ARToN oirUcKa TOOL COMPANY, .OF

LAW'roN, CHIG N.

CHUCK.

' Application filed January The main object of this invention is to.

provide an improved chuck for taps and the like by which the taps arelvery securely held, effectively centeredrelativejto theLaXis of rotation of the chuck and effectively holds the tool on reversing or retracting rotation. I Objects relating to details and economies of construction and operation of my invention will definitely appear from the detailed description to follow.

- The invention is clearly defined and pointed outin the claims.

A structure whi h in the accompanying drawing, forming a 3-3 of Fig. 2, a tap being indicated in the chuck.

Fig.4 is a transverse sectionon a line corresponding to line 4:4 of Figs. 2 and 3,

Fig. 5 is a perspective view of one of the supplemental jaws. Y f Fig. 6 is a sectional view on line 66 of Fig. 7 isia sectional viewon a line corresponding to line 7+-7 of Fig. 2 showing-the jaws engaging a tap. l

In the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views "are taken looking in the direction of the little arrows at the ends of the section lines.

' Referring to the drawing, my, improved chuck comprises a main body member '1 and a supplemental'body member 2, the supplemental body member being threaded into the main body member and providedwith a shank 3.

The main body member has ways m the jaws 5 and slots 6 extending upwardly fromjtheseways. These slots receive springs 7 for retracting the jaws, thesprings being engaged with a ring 8.

The shell 9 is threaded upon the body member 1, the lower end being tapered to fit the tapered lower end of the body member and to support the jaws in their ways so that is a preferred enibodi ment of my invention is'clearly illustratedv 2392c. Serial No. 78,910.

when'the body member 1 is screwed upwardly on the body member 2, the jaws are forced to clamping position and vice versa. In the embodiment illustrated, the main function of the jaws 5 is that of centering the tap.

The body-member 2 has a jaw chamber 10 with an internally tapered extension 11 at'its outer end for supporting'the supple} mental'jaw's12 which drive the tool.- This extension 11 also constitutes a thrustnieni ber forthe jaws 5. r

The jaws 12 have tapered ends 13 coacting with the tapered walls of the member 11 and lugs 14 disposed through slots 15 in,

the body member 2 to engage the internal annulargroove 16in the collar 17 which is threaded upon the body member 2 so that by adjustment of thiscollar the jaws '12 are opened and closed, the spring 18 between the'jaws serving to open them as the jaws arei carried rearwardly by adjustment of the co ar. Y r

The tool 19 is arranged so that it is enga-ged by both sets of jaws, the end of the tool being squared whilethe"jaws 12-are shaped to provide driving engagement therewith. The jaws being independently clamped thereon provide a. very secure grip therefor so that it is securely retained and.

aligned with the aXis of the shank'andlso thatit cannot wobble or move in the jaws and a positive driving engagement is had both for advancing and retracting the tap.

My improved chuck is especially designed by me for use'in' tapping'machines where there has been a very great loss in breakage owing to the taps not being securely held and'not properly aligned. 'My improved chuck is very 'eflicient'for the purpose; at the same time the tapsmay be quickly released orsecured, both the main body and the'collar 17 being grasped at the same time if desired. a I

The terms main and .supplemental? are iised herein mainly for convenience inde' scription. I

Havingthus described my invention, what I claim asnew and desire .tosecure by Letters Patentfisz Y x 1". In a-chuck, the combination of a main body member tapered at itsouter end and having jaw ways inits tapered portion, a

slotted supplemental body member threadways in said main ,body member, an internally tapered supporting shell thread ed upon said main body member, supplem ntal j s d spesed n sa d supp mental body member and provided with lugs projecting through its said slots, an

internally tapered supporting member for said supplemental jaws threaded into the outer end of said supplemental body member and constituting a thrust member for said jaws in said main body member, an adjusting eollar threaded upon said supplemental body member and having an in-. ternal annular groove engaging the lugs 1" aid supp em n al jaws, a d a pr ng aeting to normally separate said supplen ml " internally tapered jaw t l jaws.

In a c uck, the ee bi atie o a m hedy mem er ape -e a i o t end and ha ing :ie ays its ap re nat on, a slotted supplemental body member hr d d nt aid ma n bo y membe provided with a shank, jaws arranged in said ways in said main body member, an supporting I shell threaded upon said main body member, supplemental jaws disposed in said supplemental body member and provided with lugs projecting through its said slots, an inter.-

nally tapered supporting member for said openings thereof, said supplemental body member being provided with an internal tapered jaw supporting part at its outer a p ng acting te' manual y s parate said supplemental jaws, andv adjusting collar threaded upon said supplemental jaw mem er be se i h th less of a d pplemental jaws.

4:- n a s iek, t e'se bieat e t a m bo y m mber and a supplem ntal b dy member projecting into the inner end of said a n ody e a se -Qt ma n ja a ra ge in s id m bedy member below said supplemental body member, means for attes i g said again jaws, supp m n l being provided with an internal tapered jaw vsuppo ting Part s. o te en a d an djusting collar on said supplemental jaw member to coact with said supplemental jaws.

i 5. In a chuck, the combination of a main body member, asupplemental body member projecting into said, main body member, a set of main'jaws-arranged in saidmain body member, means for actuating said jaws, supplemental jaws disposed in said supple mental body member, said supplemental body member having an internally tapered supporting portion for said supplemental jaws, an adjusting member for said supplementa jaws'threaded uponvsaid supplem ntal bo y member, and a spring acting to normally separate said supplemental jaws.

6. In a chuck, the combination of a main body member, a supplemental body member projecting into said main body member, a set of main jaws arranged in said main, body member, means for actuating said jaws,supplemental jaws disposed in said supplemental body member, said-supplemental body member having an. internallyv tapered supporting member for said supplemental aws, and an adjustingmember for said supplemental jaws mounted upon said supp1emental body member. s

7. In a chuck, the combination of a body provided with jaw ways at its outer end and with a supplementalj aw chamber inwardly of said jaw ways, said supplemental chamher having outwardly converging walls at its outer end, a main-set of jaws arranged in the said ways, a supplemental set of jaws arranged in said supplemental jaw chamber to ooact with itstapered walls, and an independently adjusting means for actuating said sets of jaws.

,8. In a shook, the combination of a main body member and a supplemental body member projecting into said main body member, said body members having threaded engagement, a set otmain jaws arranged in said main body member to be actuated by the adjustment of the said main body member on said ,supplmental body member, supplemental jaws disposed in said supplemental body member, and-an, adjusting col.- lar threaded said supplemental body member for adjusting said supplemental aws.

. 1 In witness whereof I have hereunto set 

